發(fā)布時間：2018-05-10 23:12

  本文選題：新型煤泥分級機 + 分級��； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：分級是礦物加工工程中必不可少的環(huán)節(jié)，分級設(shè)備的選取是實現(xiàn)分級的前提。本文以課題組前人提出的設(shè)計理念為基礎(chǔ)，加工出了半工業(yè)設(shè)備——新型煤泥分級機，該分級機采用動、靜環(huán)組成的篩網(wǎng)，可以有效限制跑粗，同時能避免篩網(wǎng)的堵塞。 本文簡要地分析了新型煤泥分級機的分級機理，并建立了簡化的新型煤泥分級機模型，采用離散元分析軟件——EDEM對其進行了仿真模擬研究。同時在屯蘭選煤廠對影響新型煤泥分級機性能的操作參數(shù)進行了研究，確定了不同參數(shù)對其影響規(guī)律，并對該設(shè)備的分級效果進行了評價，此外還與現(xiàn)場分級旋流器的分級性能進行了對比。 通過EDEM仿真模擬研究，發(fā)現(xiàn)：顆粒在新型煤泥分級機內(nèi)的運動是及其復(fù)雜的；動環(huán)的運動有助于避免篩網(wǎng)的堵塞；螺旋輥的轉(zhuǎn)速是影響新型煤泥分級機分級性能的重要因素。同時得到了模擬的分級效率，最高為84.05%。 通過新型煤泥分級機的工業(yè)試驗研究，結(jié)果表明：隨著入料流量的增大，新型煤泥分級機的分級效率降低。入料流量較大時，煤泥水通過筒狀篩面的時間短，導(dǎo)致煤泥來不及分級，眾多0.2mm的物料隨著螺旋葉片的軸向推力從粗煤泥出口排出，篩分效率降低；螺旋輥轉(zhuǎn)速是影響新型煤泥分級機工作性能的一個重要因素，隨著轉(zhuǎn)速的提高，分級效率先增大后減小。過高的轉(zhuǎn)速增大了細粒級物料的錯配率，，本文中螺旋輥轉(zhuǎn)速為61rpm（頻率為30Hz）時，分級效率最佳；隨著入料濃度的增加，細粒級進入篩上物的量整體呈上升趨勢，分級效率降低。濃度太高，顆粒間會容易粘結(jié)成團，分級效果變差，入料濃度過小，設(shè)備對干物料的處理量減小，應(yīng)根據(jù)實際情況選擇一個合適的濃度范圍。本試驗中當入料濃度為101.95g/L時，新型煤泥分級機分級效率最高。 新型煤泥分級機具有一定的濃縮作用，一定的轉(zhuǎn)速下，當入料流量越小時，濃縮效果越好，此時，脫泥降灰效果也越好。在一定的操作參數(shù)條件下，新型煤泥分級機的分級性能優(yōu)于現(xiàn)場分級旋流器。
[Abstract]:Classification is an essential link in mineral processing engineering, and the selection of classification equipment is the premise of classification. On the basis of the design idea put forward by our predecessors, a new type of coal slime classifier, a semi-industrial equipment, has been developed in this paper. The new type of coal slime classifier, which is composed of moving and static rings, can effectively limit the thickness of the slime and avoid the clogging of the screen at the same time. In this paper, the classification mechanism of the new type coal slime classifier is briefly analyzed, and the simplified model of the new coal slime classifier is established. The simulation study is carried out by using the discrete element analysis software-EDEM. At the same time, the operating parameters affecting the performance of the new type coal slime classifier are studied in Tunlan Coal preparation Plant, and the influence law of different parameters is determined, and the classification effect of the equipment is evaluated. In addition, the classification performance of the hydrocyclone is compared with that of the field classifier. Through EDEM simulation, it is found that the movement of particles in the new type coal slime classifier is extremely complex, the movement of the moving ring helps to avoid the clogging of the screen, and the rotation speed of the spiral roller is an important factor affecting the classification performance of the new type coal slime classifier. At the same time, the classification efficiency of the simulation is obtained, the highest is 84.05. Through the industrial test of the new type coal slime classifier, the results show that the classification efficiency of the new type coal slime classifier decreases with the increase of the feed flow rate. When the feed flow is larger, the time of coal slurry passing through the cylindrical sieve surface is short, which leads to the slime too late to be classified, and many 0.2mm materials are discharged from the coarse slime outlet with the axial thrust of the spiral blade, and the screening efficiency decreases. The rotating speed of the spiral roller is an important factor affecting the performance of the new coal slime classifier. With the increase of the speed, the classification efficiency increases first and then decreases. Too high rotational speed increases the mismatch rate of fine grained material. In this paper, when the rotation speed of spiral roller is 61 rpm (frequency is 30 Hz), the classification efficiency is the best, and with the increase of feed concentration, the quantity of fine grain entering into the sieve is on the whole rising, and the classification efficiency decreases. If the concentration is too high, it will be easy to bond and form a mass between the particles, the classification effect will become worse, the feed concentration will be too small, and the treatment capacity of dry material will be reduced by the equipment. Therefore, a suitable concentration range should be selected according to the actual situation. In this experiment, when the feed concentration is 101.95g/L, the classification efficiency of the new coal slime classifier is the highest. The new coal slime classifier has a certain concentration effect. At a certain speed, the smaller the feed flow rate, the better the thickening effect is, and the better the desilting and ash reduction effect is. Under certain operating parameters, the classification performance of the new coal slime classifier is superior to that of the field classifier.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD94

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